I also drive in South Fl have about 8500 miles and average 14.5-15 mpg with mixed highway and city driving for my commute about 13 miles each way. got 17mpg for the only long highway trip thus far and stayed around 75 mph.

I had two Navigators, a 99 and an 03. The mileage on both was the same, 12 in town 16 on the highway. You can't expect much better from a truck of that size and comfort. You pay for the comfort in the gas expense.

By the way, they were both great trucks, and I'd have another one today were it not for the price of gas.

HWY I average high 14s, low 15s depending on how much hilly driving is done. Around town is the mid 12s. Even pulling the boat 250miles to our cottage (hwy) with 3 people and a full load, I still get in the 11s.

This all on regular octane, btw. I've never put premium in it from day 1.

Hello everyone,Boy do I have a problem I have a 2003 Navigator,Black fully loaded,BUT I'm having a real problem with my DTE gauge it seems to go crazy one minute I'm full the next it's reading one half tank the next light it goes back up to three quarters full ,and so on,The DEALER replaced under warranty my fuel sender in the tank but to no avail it still acting up. They also downloaded a update to the computer but did not fix the problem.Any HELP would bre greatly appreciated!!! Thanx,HOLLYWOOD

Our '04 2wd Nav just clicked over 50K miles. As with our Excursion, the more miles, the better these things run. The Nav started out new averaging 12 MPG, slightly better on a long highway trip. It's now getting 14 mpg around town and 15.5 on an extended highway trip. Usually loaded down with 2 kids, dogs, luggage and 2 adults. Cruise set between 75-80 mph. Have been interested in the CX-9 and Acadia, but I'm not hearing any substaintially better mileage stories. By the way, the 4x4 Excursion (V-10, 3.73) get's 13.5 mpg on the same trips the Nav is getting 15.5 on. Not good, but considering the Excursion's capabilities, I'm not disappointed! Bottom line, heavy SUV, 300+ HP engine, brick-like aerodynamics = lousy mileage!

i have a 2001 Lincoln navigator and i have love it ever since i have gotten it. i am very delighted to inform people all the time that i do have a fuel efficient suv. i really do just the other day i me and the family of five got in and worked our way to lake tahoe from a small place called santa cruz california witch is about 4-5 hours away and when i had it on drive and cruise control at exactly 71mph i looked at the message board on the head liner and it was saying 23.4mpg when we would start inclining the cruise control would work the way it should work and the mpg's came down to 19.8. the most i have ever gotten, and it is the 3rd time have done this same trip and getting really similar results. maybe off by .5 to 1 mpg' s. now i do work for ford and i always have all major services done get my oil changed every 3000k and the my navi has 54,000k. i have original wheels and always get the exact same tires from the factory and the same brand. i have also been upgrading to the new computer soft wear. you would be amazed how many different soft wear upgrades there is for these things. i only use 91octane i have tried to use 87 but my fuel eco was about 2-3 mile less per gallon. the navigator is a cruiser and theres no doubt about that when i drive in the city i drive normal not fast easy to start and as soon as im moving i just let it cruse. i get 15.6mpg. witch i would rather get this gas millage and have a reall nice looking luxury suv vs. having a really gay looking toyota prius. i love the navigator everything about it not just because i sell them all day long but theres something about them.

How can you "work for ford" and "sell them all day long". If you work for a dealer you don't work for Ford and vice versa.

i work for ford since i work for North Bay ford Lincoln mercury and last i checked i work for ford not only ford but Lincoln and mercury as well. how can i not work for ford just because im not in Detroit at the factory. your comment makes no sense.

I was wondering if you would be able to post what system you have put in to get better fuel millage? I have been only pulling 11mpg in town we do not go out of town much so it usly goes around town. I take it in for all the routine tune ups pluse i usly have them do an aditional thing every know and a again with it to keep it in top shape.